59 Coin-sized nuclear 3V battery with 50-year lifespan enters mass production (www.techspot.com) posted 1 year ago by Sadness 1 year ago by Sadness +59 / -0 Coin-sized nuclear 3V battery with 50-year lifespan enters mass production Energy storage technology has reached a transformative milestone as the BV100, a miniature atomic energy battery, enters mass production. Popular Mechanics notes that the coin-sized cell from... 47 comments share 47 comments share save hide report block hide replies
there were some tritium (super heavy hydrogen) based dials deemed to be not as dangerous
https://en.wikipedia.org/wiki/Tritium_radioluminescence